Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84d7ed5ebde05e7…

MALICIOUS

PDF

113.4 KB Created: 2021-07-05 11:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c7678262c0e2e63c7e992f6e236cb149 SHA-1: ad0e5976559d3fae2bf3860d02b6a630f9d7ff95 SHA-256: b84d7ed5ebde05e739049f4998a3d4717b358924003bee1bf81cd66d18a2ac6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=lottery+set+for+life+draw+time PDF link annotation
    • http://aylincinarli.com/fckfiles/file/xuresexudutuwuronener.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608839ccddf56---47027915355.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfff264e40---7894865717.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a614a6620a6---xekosumera.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4eb11e13---jiravagufiwavezabujeb.pdfIn PDF document text
    • http://simonide.org/userfiles/file/gojojuxodolufuwokof.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/lobuzuwurututiwejisimi.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/28806067313.pdfIn PDF document text
    • http://billsky.ee/files/file/31303497216.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/2050393257d1577bbb341249440c63a0/21382247860.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///zonudomexorenelulotomapi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f7433802---pavupew.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/jexaguge.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/rozotiwinojidirujuso.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/21329817697.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4a0b217fc4924f384f7210211d62733a/75378901801.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d57bfd2ba9f---vijawuwopevofuwesuvivuw.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bbb298db19043d45548b7bb1e494a47c/pibezawegarimazunufemakib.pdfIn PDF document text
    • https://fallsplat.se/file/5673943921.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af91a8cfd8d---xesabimidupeviwipotisaz.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/falubejuzavagorupafituked.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/wivobeluv.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac649a17ab9---rajotaj.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084578b10c67---potonajerefalasonivi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ec291a342---50372727303.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001585a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585A 17948 bytes
SHA-256: 5ee179c279b38437afed559b520f415b2e4a9e114e9aecb03fc40a615cbf2c83
font_01_sfnt_off000187f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187F6 10568 bytes
SHA-256: 6de509e1990c7618fa86d8e46ca7b94dc8c78240e7437d2709ae84ceebb6491b
font_02_sfnt_off0001a032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1